(19)
(11) EP 0 277 000 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.10.1989 Bulletin 1989/42

(43) Date of publication A2:
03.08.1988 Bulletin 1988/31

(21) Application number: 88300692.6

(22) Date of filing: 27.01.1988
(51) International Patent Classification (IPC)4: G11B 20/10, G11B 5/09
(84) Designated Contracting States:
DE FR GB

(30) Priority: 27.01.1987 JP 16762/87
16.10.1987 JP 261319/87

(71) Applicant: VICTOR COMPANY OF JAPAN, LIMITED
Yokohama-Shi Kanagawa-Ken 221 (JP)

(72) Inventor:
  • Higurashi, Seiji
    Tokyo (JP)

(74) Representative: Robinson, John Stuart et al
MARKS & CLERK, 57/60 Lincoln's Inn Fields
London WC2A 3LS
London WC2A 3LS (GB)


(56) References cited: : 
   
       


    (54) Magnetic recording and/or reproducing apparatus


    (57) A magnetic recording apparatus comprising an audio signal processing circuit (32a, 32b, 33a, 33b, 34a, 34b, 35) for converting an input analog audio signal into a digital audio signal; a modulating circuit (36) for subjecting the digital audio signal to a modulation selected from a multi-phase differential phase shift keying modulation (DPSK) or an offset-multi-phase differential shift keying modulation (ODPSK) to produce a modulated digital audio signal; an adding circuit (39) for adding a high-frequency bias signal to the modulated digital audio signal; an audio signal recording unit (41a, 41b) for recording the modulated digital audio signal with the high-frequency bias signal added thereto on a track formed in a deep layer portion of a magnetic layer of a magnetic tape (43); and a video signal recording circuit (26, 27, 28a, 28b) for recording an input video signal on a video track formed in a surface layer portion of the magnetic layer of the magnetic tape.







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